JPH07101548B2 - Car audio system - Google Patents

Description

The present invention relates to an on-vehicle audio device such as a car stereo device and a car radio, and more particularly to a system in which a main body part and an operating part are detachable (so-called, Detachable type) vehicle audio device.

[Conventional technology]

It is known that an on-vehicle audio device adopts a detachable system for the purpose of preventing theft. An example of this method is shown in FIGS.

That is, the on-vehicle audio device is roughly divided into a main body portion 100 fixedly attached to the vehicle side and a detachable grill 101 detachably attached to the main body portion 100 (FIG. 4). The detachable grill 101 is detachably supported by an inner lid 102 pivotally attached to the main body 100 so that the detachable grill 101 can be opened and closed.
It is opened together with it (Fig. 5), and then only the detachable grill 101 is removed (Fig. 6). Code 1
03 is a cassette tape insertion slot.

As shown in FIG. 6, the main body 100 and the detachable grill 101 are electrically connected by contact between a pair of contact terminals 104 and 105.

The main body 100 stores a mechanism part such as a cassette tape recorder mechanism part or a CD player mechanism part, a system controller, and the like.

The detachable grille 101 accommodates the central function parts of the in-vehicle audio device such as an operation key, a display device, and a remote control receiver.

Therefore, by removing the detachable grill 101 from the main body 100, the vehicle audio device cannot substantially function, and the theft is thereby suppressed.

Next, FIG. 3 shows an electrical main part of the detachable grill system. The detachable grill 101 includes a display device 3 such as an LCD display, a display driver 4 for driving the input device 5, an input key 5 for operation input, and a key input for outputting a command from the input key 5 to the system controller 2. A controller 6, a light receiver 7 that receives a control signal from a remote control device, and a remote control receiver 8 that decodes the received signal are provided.

The main body section 100 includes an audio device section 1 such as a cassette tape recorder and a CD player, and a system controller 2 for controlling the whole system.

Then, the display driver 4 and the key input controller 6
Are electrically connected to the system controller 2 via a system bus 9 composed of a plurality of signal lines (for example, five), and the audio device section 1 and the system controller 2 are also connected via the system bus 9. On the other hand, the remote control receiver 8 is also connected to the system controller 2 via the signal line 10. Reference numeral 11 is a power supply line for supplying power from the main body 100 side to the detachable grill 101 side.

Next, the general operation will be described.

The operation input by the input key 5 is decoded by the key input controller 6, and the operation command signal D _K is transmitted to the system controller 2 via the system bus 9. The display signal D _D from the system controller 2 is also sent to the system bus 9
Is transmitted to the display driver 4 via. In this way, the display driver 4, the key input controller 6, the system controller 2, and the audio device section 1 share the system bus 9. On the other hand, the remote control control signal D _R of the remote control receiver 8 is transmitted to the system controller 2 via the signal line 10.

[Problems to be Solved by the Invention]

A problem with the conventional vehicle-mounted audio device is that the display driver 4, the key input controller 6 and the system controller 2 communicate with each other via the system bus 9, and the same system bus 9 is used in the audio device unit 1. That is the point of sharing. That is, the former point complicates the connection relationship between the detachable grill 101 and the main body 100, which are attached and detached because the number of signal lines of the system bus 9 is large, and the contact terminals 104 and 105 also become complicated. . On the other hand, the latter point causes noise generated between the contact terminals 104 and 105 when the detachable grill 101 is attached or detached, to be mixed into the audio device unit 1 via the system bus 9 and cause a malfunction.

Therefore, it is an object of the present invention to reduce the number of communication lines between the detachable grill and the main body and prevent malfunction due to noise.

[Means for Solving the Problems]

In order to solve the above problems, the present invention has a main body having a system controller, a key input controller for outputting an operation signal to the system controller, and a remote control receiver, and is detachably connected to the main body. In an in-vehicle audio device including an operation section, gate means for selectively outputting either one of the operation signals from the key input controller or the remote control receiver, and the output signal of the gate means And a shared transmission line for transmitting the system controller.

[Action]

According to the present invention, the gate means selectively outputs either the operation signal from the key input controller or the operation signal of the remote control receiver. This shows the same function as an operation command even if the operation signal from the key input controller and the operation signal from the remote control reception signal are different from the input key or the transmitter of the remote control device. Therefore, it is based on the fact that either one should be selected. Any operation signal selected by the gate means is transmitted to the system controller through the shared transmission line. In this case, only one shared transmission line is required if only the operation signal is transmitted, and it is not necessary to use the system bus as in the conventional case. Therefore, the number of signal lines can be reduced. Further, since the system bus leading to the audio device unit is not used, noise when attaching and detaching the detachable grill does not enter the system bus.

〔Example〕

 Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. The third in FIG.
The same parts as those in the conventional example in the figure are denoted by the same reference numerals, and detailed description thereof will be omitted.

1 is different from FIG. 3 in that the operation command signal D _K of the key input controller 6 and the remote control control signal D _R of the remote control receiver 8 are passed through the gate means composed of the AND gate 15 and the OR gate 16. The AND gate 15 _applies the prohibition signal D _EN from the key input controller 6 to the point where it is connected to the system controller 2 by one shared signal line 12.
To the system controller through the signal line 13 and to transmit the display signal D _D of the display driver 4 through one signal line 14. The contact terminals 104a and 105a are contact terminals for connecting or disconnecting the detachable grill 101 and the main body 100, and the number of terminals is reduced as the system bus 9 is not used.

Here, FIG. 2A shows the signal format of the remote control signal D _R , and FIG. 2B shows the signal format of the operation command signal D _K of the key input controller 6.

As shown in FIG. 2 (a), the remote control signal D _R includes a leader code (Leader Code) LC indicating the start of transmission and a custom code (for identifying each device of the audio device unit 1 which is a controlled device). Custom Code, 8bit) CC, inversion code ▲ ▼ of this custom code CC, data code (Data Code, 8bit) DC indicating the operation command content, and inversion code ▲ ▼ of this data code DC in time series. Formed side by side. Among the above codes, inversion signals such as inversion code ▲ ▼ in addition to custom code CC and inversion code ▲ ▼ in addition to data code DC are added to check reliability of signal transmission error. Is to improve.

On the other hand, as shown in FIG. 2B, the signal format of the operation command signal D _K is simpler than that of the remote control signal D _R. This is because the operation corresponding to the custom code CC is performed inside the main body from the key input controller 6, so the operation command signal D _K includes the cam tom code CC and the reverse code ▲ ▼.
This is because it is not necessary to include the inversion code ▲ ▼ because it is not necessary to include and the transmission error in the signal transmission in the main body is extremely small. As a result, the operation command signal D _K basically consists of only the reader code LC and the decoder code DC.

However, in general, the key input controller 6 has a higher priority than the remote control receiver 8. Therefore, when the input key 5 is pressed during remote control transmission, the key input controller 6 may start transmitting the operation command signal D _K.

Therefore, the dummy bit DB is used as a countermeasure. The dummy bit DB has the same signal waveform as the reader code LC. When the operation command signal D _K is newly transmitted from the state where the key input controller 6 is not transmitting, the dummy bit DB is added before the reader code LC (see FIG. 2 (b), broken line). . This dummy bit DB is not recognized as data by the system controller 2 and is treated as an error. Even if the operation key of the remote controller is continuously pressed, the remote controller input process is temporarily stopped and the key input controller 6
The process of is started. Dummy bit DB when key input controller 6 is pressed continuously and transmission continues
Is not added.

Next, the operation will be described.

Now, when an operation input is made from the input key 5, the operation command signal D _K corresponding to the operation content is input to one of the OR gates 16 and the inhibition signal D _EN (= “L”) is input to the AND gate 15.
Is output to one of the input terminals. As a result, AND gate 15
Since the input logic condition of is not satisfied, the remote control receiver 8 is prohibited from transmitting the remote control signal D _R. Therefore, the operation command signal D _K is transmitted to the system controller 2 through the OR gate 16 and the signal line 13. On the other hand, the display signal from the system controller 2 is transmitted to the display driver 4 via the D _D signal line 14. Signal line 13
Is for transmitting the inhibition signal D _EN to the system controller 2 in order to match the operation of the system controller 2 with the operation of the AND gate 15.

When there is no operation input from the input key 5 and an operation command is given to the remote control receiver 8 via the light receiver 7, the logic of the prohibition signal D _EN is “H”, and therefore the operation of the AND gate 15 is Not prohibited, signal line through OR gate 16
It is selected by 13 and transmitted by one shared signal line 12. Also, the system bus 9 is a detachable grill 10
1 is not connected to the main body 100, the number of wires is reduced, and noise generated during attachment / detachment is reduced by the audio device unit 1.
It can be prevented from being mixed in.

In the above embodiments, the prohibition signal D _EN is generated from the key input controller 6, but this is because the priority of the input controller 6 side is made higher, and the remote control receiver 8 is not limited to this. The priority of can also be made high. In that case, it can be realized by outputting the prohibition signal D _EN to the remote control receiver 8 side so that the remote control control signal D _R is preferentially transmitted when received by the remote control receiver 8. In either case, either the input controller 6 or the remote control receiver 8 of the same quality is selected in terms of operation input.

〔The invention's effect〕

As described above, according to the present invention, one of the operation signals from the key input control roller or the remote control receiver is selected, and the selected signal is transmitted to the system controller. It is possible to reduce the number of communication lines connecting between the main unit and the main unit, and prevent noise generated during attachment / detachment from entering the system controller to prevent malfunction.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is an explanatory diagram showing a format of a transmission signal in the present invention, FIG. 3 is a block diagram of a conventional detachable car audio system, and FIG. ~ Fig. 6 is a perspective view of an on-vehicle audio device of the detachable system. 100 …… Main body 101 …… Detachable grill 104 …… Contact terminal 105 …… Contact terminal 1 …… Audio device section 2 …… System controller 4 …… Display driver 6 …… Key input controller 8 …… Remote control receiver 9 …… System bus 12 …… Common signal line 13 …… Signal line 14 …… Signal line 15 …… AND gate 16 …… OR gate D _D …… Display signal D _K …… Operation command signal D _R …… Remote control signal

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04Q 9/00 301 A

Claims (1)

[Claims] 1. A main body having a system controller,
An in-vehicle audio device comprising a key input controller for outputting an operation signal to the system controller and a remote control receiver, and an operation section detachably connected to the main body section, wherein the key input controller or Gate means for selectively outputting any one of the operation signals from the remote control receiver, and a shared transmission line for transmitting the output signal of the gate means to the system controller. Car audio system.